mirror of
https://github.com/dankamongmen/notcurses.git
synced 2024-10-31 15:20:13 +00:00
105 lines
3.7 KiB
Markdown
105 lines
3.7 KiB
Markdown
% notcurses_menu(3)
|
|
% nick black <nickblack@linux.com>
|
|
% v1.6.11
|
|
|
|
# NAME
|
|
|
|
notcurses_menu - operations on menus
|
|
|
|
# SYNOPSIS
|
|
|
|
**#include <notcurses/notcurses.h>**
|
|
|
|
```c
|
|
struct ncmenu;
|
|
struct ncplane;
|
|
struct ncinput;
|
|
struct notcurses;
|
|
|
|
struct ncmenu_section {
|
|
char* name; // utf-8 c string
|
|
struct ncmenu_item {
|
|
char* desc; // utf-8 menu item, NULL for horizontal separator
|
|
ncinput shortcut; // shortcut, all should be distinct
|
|
}* items;
|
|
int itemcount;
|
|
};
|
|
|
|
#define NCMENU_OPTION_BOTTOM 0x0001 // bottom row (as opposed to top row)
|
|
#define NCMENU_OPTION_HIDING 0x0002 // hide the menu when not unrolled
|
|
|
|
typedef struct ncmenu_options {
|
|
struct ncmenu_section* sections; // 'sectioncount' menu_sections
|
|
int sectioncount; // must be positive
|
|
uint64_t headerchannels; // styling for header
|
|
uint64_t sectionchannels; // styling for sections
|
|
unsigned flags; // bitfield on NCMENU_OPTION_*
|
|
} ncmenu_options;
|
|
```
|
|
|
|
**struct ncmenu* ncmenu_create(struct notcurses* nc, const menu_options* opts);**
|
|
|
|
**int ncmenu_unroll(struct ncmenu* n, int sectionidx);**
|
|
|
|
**int ncmenu_rollup(struct ncmenu* n);**
|
|
|
|
**int ncmenu_nextsection(struct ncmenu* n);**
|
|
|
|
**int ncmenu_prevsection(struct ncmenu* n);**
|
|
|
|
**int ncmenu_nextitem(struct ncmenu* n);**
|
|
|
|
**int ncmenu_previtem(struct ncmenu* n);**
|
|
|
|
**const char* ncmenu_selected(const struct ncmenu* n, struct ncinput* ni);**
|
|
|
|
**const char* ncmenu_mouse_selected(const struct ncmenu* n, const struct ncinput* click, struct ncinput* ni);**
|
|
|
|
**struct ncplane* ncmenu_plane(struct ncmenu* n);**
|
|
|
|
**bool ncmenu_offer_input(struct ncmenu* n, const struct ncinput* nc);**
|
|
|
|
**int ncmenu_destroy(struct ncmenu* n);**
|
|
|
|
# DESCRIPTION
|
|
|
|
A notcurses instance supports menu bars on the top or bottom row of the true
|
|
screen. A menu is composed of sections, which are in turn composed of items.
|
|
Either no sections are visible, and the menu is *rolled up*, or exactly one
|
|
section is *unrolled*. **ncmenu_rollup** places an ncmenu in the rolled up
|
|
state. **ncmenu_unroll** rolls up any unrolled section, and unrolls the
|
|
specified one. **ncmenu_destroy** removes a menu bar, and frees all associated
|
|
resources.
|
|
|
|
**ncmenu_selected** return the selected item description, or NULL if no section
|
|
is unrolled, or no valid item is selected. **ncmenu_mouse_selected** returns
|
|
the item selected by a mouse click (described in **click**), which must be on
|
|
the actively unrolled section. In either case, if there is a shortcut for the
|
|
item and **ni** is not **NULL**, **ni** will be filled in with the shortcut.
|
|
|
|
The menu can be driven either entirely by the application, via direct calls to
|
|
**ncmenu_previtem**, **ncmenu_prevsection**, and the like, or **struct ncinput**
|
|
objects can be handed to **ncmenu_offer_input**. In the latter case, the menu
|
|
will largely manage itself. The application must handle item selection (usually
|
|
via the Enter key and/or mouse click) itself, since the menu cannot arbitrarily
|
|
call into the application. **ncmenu_offer_input** will handle clicks to unroll
|
|
menu sections, clicks to dismiss the menu, Escape to dismiss the menu, left
|
|
and right to change menu sections, and up and down to change menu items (these
|
|
latter are only consumed if there is an actively unrolled section).
|
|
|
|
# RETURN VALUES
|
|
|
|
**ncmenu_create** returns **NULL** on error, or a pointer to a valid new ncmenu.
|
|
Other functions return non-zero on error, or zero on success. Almost all errors
|
|
are due to invalid parameters.
|
|
|
|
**ncmenu_offer_input** returns **true** if the menu "consumed" the input, i.e.
|
|
found it relevant and took an action. Otherwise, **false** is returned, and the
|
|
**struct ncinput** should be considered irrelevant to the menu.
|
|
|
|
# SEE ALSO
|
|
|
|
**notcurses(3)**,
|
|
**notcurses_input(3)**,
|
|
**notcurses_plane(3)**
|